A vertical axis wind turbine

Abstract

The present invention belongs to the technical field of wind power generation, and particularly relates to a vertical axis wind turbine, comprising a wind turbine body, the wind turbine body comprising a vertical axis and blades mounted on the vertical axis, the blades of the wind turbine body being sheathed with a circular pipe on the periphery, the circular pipe being coaxial with the vertical axis; a plurality of air inlets are evenly arranged on the outside of the circular pipe, each of which is provided with a baffle for directing wind to the air inlet; a plurality of air outlets are evenly arranged on the inside of the circular pipe, each of which is provided with a partition for directing wind to the air outlet. The present invention changes a horizontally flowing natural wind field into an annular flow wind field through a circular pipe, and the wind speed can be greatly increased, thereby improving the wind energy utilization coefficient of the vertical axis wind turbine, so that the rotation speed of the vertical axis wind turbine can be greater than the wind speed.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a vertical axis wind turbine. Background Art

[0002] The most common wind turbines nowadays are horizontal axis three-blade wind turbines. The horizontal wind passes vertically through the blade rotation plane, which belongs to the lift type wind turbine. The blades of this type of wind turbine are slender, reaching tens of meters or even hundreds of meters, and the weight is also large, which brings great difficulties to processing, transportation and installation. Various types of vertical axis wind turbines have also appeared in history. The resistance type vertical axis wind turbine has the characteristics of good starting performance and does not require a wind system, but the wind energy utilization coefficient is low. In recent years, domestic and foreign scholars have done a lot of research on wind gathering devices outside wind turbines in order to improve the power coefficient of resistance type vertical axis wind turbines. These devices are mainly divided into three types: shielding type, shielding type and guide vane type. Although the shielding type and shielding type wind gathering devices improve the power coefficient of the resistance type vertical axis wind turbine, it causes the vertical axis wind turbine to lose the advantage of not being controlled by wind direction. The guide vane type wind gathering device retains this advantage, but the improvement effect is limited. These wind gathering devices only partially change the flow field of the wind, so the power coefficient is not greatly improved, and it is difficult to compete with the horizontal axis lift type wind turbine. Summary of the invention

[0003] In view of the above technical problems, an object of the present invention is to provide a vertical axis wind turbine for solving the technical problem that the power coefficient is not greatly improved in the prior art.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A vertical axis wind turbine comprises a wind turbine body, wherein the wind turbine body comprises a vertical axis 1 and blades 6 mounted on the vertical axis 1, and is characterized in that: a circular pipe 3 is sleeved on the outer periphery of the blades 6 of the wind turbine body, and the circular pipe 3 is coaxial with the vertical axis 1; a plurality of air inlets 8 are evenly arranged on the outer side of the circular pipe 3, and each air inlet 8 is provided with a baffle 4 for guiding wind to the air inlet 8; a plurality of air outlets 9 are evenly arranged on the inner side of the circular pipe 3, and each air outlet 9 inside the circular pipe 3 is provided with a partition 5, and the partition 5 is used to guide wind to the air outlet 9.

[0006] Furthermore, the cross section of the baffle 4 is C-shaped, and each baffle 4 is tangent to the annular pipe 3 .

[0007] Furthermore, the upper and lower parts of the annular pipe 3 are both provided with horizontally arranged annular guide plates 7 , and the annular groove formed by the two guide plates 7 and the annular pipe 3 faces the inner side of the annular pipe 3 .

[0008] Furthermore, the annular pipe 3 is formed by bending a steel pipe, or by shrimp-bending and welding.

[0009] Furthermore, the outer wall of the annular pipe 3 is coated with an anti-corrosion layer, and the inner wall is polished.

[0010] Furthermore, there are twelve air inlets 8 and three air outlets 9, and the area of ​​the air inlet 8 is three times greater than the area of ​​the air outlet 9; wherein the three partitions 5 divide the entire circular duct 3 into three channels, and every four air inlets 8 correspond to one air outlet 9, and there are three effective air inlets 8.

[0011] Furthermore, the center line of the blade 6 and the axis of the annular pipe 3 are located in the same horizontal plane, and the height of the blade 6 is 1 / 2 to 2 / 3 times the diameter of the annular pipe 3 .

[0012] Furthermore, the height of the air outlet 9 is equal to the height of the blade 6, and the upper and lower ends are flush respectively; the width of the air outlet 9 is the arc length corresponding to the central angle of 40°.

[0013] Furthermore, the vertical shaft 1 is connected to the blade 6 through the hub 2, the radial dimension of the blade 6 is equal to the radius of the hub 2, and the gap between the blade 6 and the annular pipe 3 is 5 mm.

[0014] Furthermore, the blade 6 includes a windward panel 61 and a windward panel 62 with V-shaped cross-sections. The windward panel 61 and the windward panel 62 are connected around by a connecting plate 63 . The windward panel 61 and the windward panel 62 are also provided with reinforcing ribs 64 .

[0015] The beneficial effects of the present invention are as follows: the present invention changes the horizontal natural wind field into an annular flow wind field through the circular ring duct, the wind speed can be greatly increased, and the wind energy utilization coefficient of the vertical axis wind turbine is improved, so that the rotation speed of the vertical axis wind turbine can be greater than the wind speed. At the same time, it has good starting performance and does not need to add a wind device. The blades make the annular flow wind field flow downward and upward, avoiding the disadvantage of the general resistance-type vertical axis wind turbine blades doing negative work; and the wind after the work is discharged upward and downward in time, reducing the amount of wind wrapped by the blades, and further improving the power coefficient of the wind turbine. Compared with the horizontal axis lift type wind turbine, this wind turbine has the advantages of good visual effect, environmental friendliness, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic top view of a vertical axis wind turbine.

[0017] Figure 2 for Figure 1 Schematic side view of .

[0018] Figure 3A schematic cross-sectional view of a blade.

[0019] In the figure: 1-vertical axis; 2-hub; 3-annular pipe; 4-baffle; 5-partition; 6-blade; 61-windward panel; 62-windward panel; 63-connecting plate; 64-reinforcement rib; 7-guide plate; 8-air inlet; 9-air outlet. DETAILED DESCRIPTION

[0020] In order to better understand the present invention, the technical solution of the present invention is further described below in conjunction with embodiments and drawings.

[0021] like Figure 1 As shown, a vertical axis wind turbine includes a wind turbine body, the wind turbine body includes a vertical axis 1 installed on the wind turbine tower and blades 6 installed on the vertical axis 1; the vertical axis 1 is connected to the blades 6 through a hub 2, the radial size of the blades 6 is equal to the radius of the hub 2, the hub 2 is made of steel plate bent into a cylindrical body, the blades 6 are welded to the hub 2, and the hub 2 is connected to the vertical axis 1 by a flat key or a spline. Figure 3 As shown, the blade 6 includes a windward panel 61 and a windward panel 62 with a V-shaped cross section. The windward panel 61 and the windward panel 62 are connected via a connecting plate 63 . The windward panel 61 and the windward panel 62 are also provided with reinforcing ribs 64 .

[0022] The wind turbine body has a circular pipe 3 on the outer periphery of the blade 6, which is welded to the tower through steel sections. The circular pipe 3 is coaxial with the vertical axis 1. The circular pipe 3 is formed by bending a steel pipe. If the diameter is too large to bend the pipe, it is formed by shrimp bend welding (with as many shrimp bends as possible). The outer wall of the circular pipe 3 is coated with an anti-corrosion layer, and the inner wall is polished. Figure 2 As shown, the upper and lower parts of the annular pipe 3 are both provided with horizontally arranged annular guide plates 7 , and the annular groove formed by the two guide plates 7 and the annular pipe 3 faces the inner side of the annular pipe 3 .

[0023] like Figure 1As shown, twelve air inlets 8 are evenly arranged on the outside of the circular duct 3, and each air inlet 8 is provided with a baffle 4 for guiding the wind to the air inlet 8, and the cross-section of the baffle 4 is C-shaped (that is, the whole is semi-cylindrical), and each baffle 4 is tangent to the circular duct 3; three air outlets 9 are evenly arranged on the inside of the circular duct 3, and each air outlet 9 inside the circular duct 3 is provided with a (circular arc-shaped) partition 5, and the partition 5 is used to guide the wind to the air outlet 9; the three partitions 5 divide the entire circular duct 3 into three channels, and every four air inlets 8 correspond to one air outlet 9, and there are three effective air inlets 8, among which the area of ​​the air inlet 8 is three times larger than the area of ​​the air outlet 9 (the height of the air inlet 8 is as close to the diameter of the circular duct 3 as possible, and the width is as large as possible, as long as welding space is left for the baffle 4 and the partition 5).

[0024] like Figure 2 As shown, the center line of the blade 6 and the axis of the circular pipe 3 are located in the same horizontal plane; the height of the air outlet 9 is equal to the height of the blade 6, and the upper and lower ends are flush respectively; the width of the air outlet 9 is the arc length corresponding to the central angle of 40°; the height of the blade 6 is 1 / 2 to 2 / 3 times the diameter of the circular pipe 3; the gap between the blade 6 and the circular pipe 3 is 5 mm.

[0025] The partition plate 5 and the baffle plate 4 can be made of bent steel plates. The baffle plate 4 is welded to the outer wall of the annular pipe along the tangent direction. The blade 6 is welded with steel plates, and the middle reinforcement rib is first welded to the panel on the windward side and then welded to the panel on the windward side (plug welding can be used). The guide plate 7 has two pieces, which are annular plates, which are welded to the upper and lower surfaces of the annular pipe respectively, and its surface is flush with the highest point of the pipe surface.

[0026] The connection in the above scheme is mostly welded, and all welds must be ground and polished. In order to reduce the flow resistance of wind in the annular pipe 3, the inner surface of the annular pipe 3 is smooth, and the inner and outer surfaces of the baffle 4 and the arc-shaped partition plate 5 are also smooth.

[0027] The wind direction change process and principle of the present invention: The structure of the present invention ensures that no matter what the wind direction is, there are always three air inlets 8 that are basically consistent with the natural wind direction. The wind enters the annular duct 3 from these three air inlets 8 along the tangential direction of the circumference, is accelerated in the annular duct 3, and then flows out tangentially from the air outlet 9 and blows toward the impeller 6 along the tangential direction. The other air inlets on the windward side cannot enter the wind because of the obstruction of the baffle. Figure 3As shown, the windward surface of the blade 6 is convex in the middle, that is, it is inclined upward and backward and downward and backward from the middle. This structure not only strengthens the strength of the blade 6, but also makes the wind blowing toward the blade 6 push the blade and then flow downward and upward, and flow out from the upper and lower end surfaces of the circular pipe 3. The height of the blade 6 is 1 / 2 to 2 / 3 times the diameter of the circular pipe 3. After the horizontal wind bypasses the windward surface of the circular pipe 3, it passes over the top of the blade 6, forming a siphon effect in the center of the circular pipe 3, which is conducive to the discharge of the airflow after work.

[0028] The above description is only an application example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the protection scope of the present invention.

Claims

1. A vertical axis wind turbine, comprising a wind turbine body, wherein the wind turbine body comprises a vertical axis (1) and blades (6) mounted on the vertical axis (1), characterized in that: A circular pipe (3) is sleeved on the outer periphery of the blades (6) of the wind turbine body, and the circular pipe (3) is coaxial with the vertical axis (1); a plurality of air inlets (8) are evenly arranged on the outer side of the circular pipe (3), and each air inlet (8) is provided with a baffle (4) for directing wind toward the air inlet (8); a plurality of air outlets (9) are evenly arranged on the inner side of the circular pipe (3), and each air outlet (9) inside the circular pipe (3) is provided with a partition (5), and the partition (5) is used to direct wind toward the air outlet (9); The upper and lower parts of the annular pipe (3) are both provided with horizontally arranged annular guide plates (7), and the annular groove formed by the two guide plates (7) and the annular pipe (3) faces the inner side of the annular pipe (3); The air inlets (8) are provided with twelve, the air outlets (9) are provided with three, and the area of ​​the air inlets (8) is three times greater than the area of ​​the air outlets (9); wherein the three partitions (5) divide the entire annular duct (3) into three channels, and every four air inlets (8) correspond to one air outlet (9), and there are three effective air inlets (8).

2. A vertical axis wind turbine according to claim 1, characterized in that: The cross section of the baffle (4) is C-shaped, and each baffle (4) is tangent to the annular pipe (3).

3. A vertical axis wind turbine according to claim 1, characterized in that: The annular pipe (3) is formed by bending a steel pipe, or by shrimp-bending and welding.

4. A vertical axis wind turbine according to claim 3, characterized in that: The outer wall of the annular pipe (3) is coated with an anti-corrosion layer, and the inner wall is polished.

5. A vertical axis wind turbine according to claim 1, characterized in that: The center line of the blade (6) and the axis of the annular pipe (3) are located in the same horizontal plane, and the height of the blade (6) is 1 / 2 to 2 / 3 times the diameter of the annular pipe (3).

6. A vertical axis wind turbine according to claim 1, characterized in that: The height of the air outlet (9) is equal to the height of the blade (6), and the upper and lower ends are flush respectively; the width of the air outlet (9) is the arc length corresponding to the central angle of 40°.

7. A vertical axis wind turbine according to claim 1, characterized in that: The vertical shaft (1) is connected to the blade (6) via the hub (2); the radial dimension of the blade (6) is equal to the radius of the hub (2); and the gap between the blade (6) and the annular pipe (3) is 5 mm.

8. A vertical axis wind turbine according to claim 1, characterized in that: The blade (6) comprises a windward panel (61) and a windward panel (62) with a V-shaped cross section. The windward panel (61) and the windward panel (62) are connected around each other via a connecting plate (63). The windward panel (61) and the windward panel (62) are also provided with reinforcing ribs (64).

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